The comparative creep properties of several types of commercial coppers

Schwope, A.D.; Smith, K.F.; Jackson, L. R.

doi:10.1007/bf03398113

Cited by 3 publications

(6 citation statements)

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“…The drawn copper which has been heated 10 min at 500˚C exhibits the longer creep life. In contrary to our results, Schwope, Smith, and Jackson [15] have investigated several commercial copper and reported that cold work increases its creep strength.…”

Section: Resultscontrasting

confidence: 99%

“…Consequently, it is important to characterize its creep and creep behaviors because this material requires adequate creep resistance to ensure reliable performance in service. We note that there were creep tests carried out on high purity copper wires [8][9][10][11][12][13][14][15][16]. However, some limited scientific works have been concerned on creep behavior of drawn copper [15,16].…”

Section: Introductionmentioning

confidence: 99%

“…We note that there were creep tests carried out on high purity copper wires [8][9][10][11][12][13][14][15][16]. However, some limited scientific works have been concerned on creep behavior of drawn copper [15,16]. Schwope, Smith and Jackson [15], have been studied creep properties of several types of commercial coppers.…”

Section: Introductionmentioning

confidence: 99%

“…However, some limited scientific works have been concerned on creep behavior of drawn copper [15,16]. Schwope, Smith and Jackson [15], have been studied creep properties of several types of commercial coppers. In their investigation, data were presented showing the effect of cold work on the short time creep strengths of various types of commercial copper under several conditions.…”

Section: Introductionmentioning

confidence: 99%

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Effect of Prior-Heat Treatments on the Creep Behavior of an Industrial Drawn Copper

Boumerzoug¹,

Gareh²,

Beribeche³

2012

WJCMP

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The effect of prior-heat treatments at 500℃, 600℃ and 700℃ on the creep behavior of an industrial drawn copper has been studied under constant stresses (98, 108 and 118 MPa) and temperatures (290℃ and 340℃). The results revealed that the creep behavior and the creep life of the material depend strongly on these prior-heat treatments. The apparent activation energy <i>Q<sub>c</sub></i> for different creep tests of a drawn copper wire was calculated. The fracture mechanism of the material is characterized using optical microscopy

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Section: Resultscontrasting

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Effect of Prior-Heat Treatments on the Creep Behavior of an Industrial Drawn Copper

Boumerzoug¹,

Gareh²,

Beribeche³

2012

WJCMP

View full text Add to dashboard Cite

show abstract

“…However, very limited information is available about creep behavior of cold worked copper by wiredrawing technique. For example, Schwope et al [6], studied creep properties of several types of commercial coppers. In their investigation, data were presented showing the effect of cold work on the short time creep strengths of various types of commercial copper under several conditions.…”

Section: Introductionmentioning

confidence: 99%

Heat Treatments Effect on the Mechanical Properties of Industrial Drawn Copper Wires

Boumerzoug

2013

AMR

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In this present investigation, the mechanical properties of industrial drawn copper wires have been studied by creep tests, tensile tests and hardness Vickers. The effect of prior heat treatments at 500°C for different time on the drawn wires behavior was the main goal of this investigation. We have found that these heat treatments influenced the creep behavior of drawn wires and recorded shape curves. The creep tests were applied under ambient atmosphere at 240 °C. The creep duration before rupture decreased with the prior heat treatment time. The creep tests results were confirmed by tensile tests. A relationship between the hardness and the ultimate tensile strength of this industrial material has been established. Optical and scanning electron microscopy observations have been also used. Cross section observations of the wire after tensile or creep-rupture tests have shown that the mechanism of rupture was mainly controlled by the void formation.

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Creep of high-purity copper

Jenkins¹,

Digges²

1950

J. RES. NATL. BUR. STAN.

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All of the fuel tested in this program changed in octane rating as the pressure of the altitude chamber was decreased. In general, the fuels that were the most sensitive to altitude changes were those with the high9s.t se nsitivity to engil~e severity, as defined by the dIffer ences between thClr Motor Method and Researc~l Method rati!lgs. ~his is to be expected, as the hJgh er compreSSIOn ratIOs used at lower chamber pressures. increase the engine severity by raising the compr eSSIOn temperatures.It has been shown that decreased inlet temperature and decreased speed shift altitude ratings by the Motor Method toward their sea-level values, but at different rates for various fu els. Although th e effects of spark advance on this method were not investigated, a change in this factor might prove advantageous. Larger carburetor venturis have proved useful, and permit ratings to be maintained at about their ea-Ievel values up to altitudes to 3,000 to 4 000 ft. It is possible that the Motor Method rating~ are capable of being equalized throughout the altitude range by usc of a suitable combina tion of changed conditions.The Research Method, on the other hand do cs not lend itself well to modifications of this' type. fhe spark advanc.e is already nearly the optimum, mlet temperature lS at about the minimum that will assure adequate vaporization of the fuel the volumetric efficiency is improved very little by use of a larger venturi, and the engine speed is already very low.It appears, therefore, that the surest way of making the engine severity equal to that a t sea level, regardless of the altitude, is to sup ercharge the inlet and thro~t~e the exhau~t, thereby simulating sea-level conclttIOns. For thls purpose, a small single-sta,ge centrifugal compressor would probably suffice. The ail' would enter the blower through a standard humidity-controll ing ice towel', and thence through the s tandard air h eater to a pressurized carburetor. It is possible that an after-cooler may also be necessary to k eep the inlet temperature below 125 0 F in the R esearch Method at the lower chamber pressures..This investigation was carri ed out in cooperation wlth the Octane Correlation Advisory Committee of the Division of R efining of the American Petroleum Institute. Members of this committee arc: Bruno R. Siegel, chairman, Frank C. Burk, Carl E. Habermann, J . E. Taylor; associate members are Harold M. Trimble, H. R. Stacey , John M. Snell, Afton D. Puckett, and Hudson W. K ellogg. Appreciation is expressed to the committee members for planning th e scope of the work and their expert advice in car~'ying it o~t. Cred.it is also due th e following for thCJ.r work ltl operatmg the engines and alti tude eqll1pment: IV. C. Lacey, Myron C. Wolfe, Jame Creep tests we; e made at l10 0 , 250 0 , and. 300 0 F on a.nn~aled oxyge n-free high-conductIvIty copper .. lhe rate of 10adll1g to the ultImate had a slgn Ifl cant eff ect on t h e amount of plastic ext e nsIOn and t hereby affected the creep behavior. The strain rate durin g the so-calle...

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The comparative creep properties of several types of commercial coppers

Cited by 3 publications

References 0 publications

Effect of Prior-Heat Treatments on the Creep Behavior of an Industrial Drawn Copper

Effect of Prior-Heat Treatments on the Creep Behavior of an Industrial Drawn Copper

Heat Treatments Effect on the Mechanical Properties of Industrial Drawn Copper Wires

Creep of high-purity copper

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